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DERIVATIVE FINANCIAL INSTRUMENTS - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
institution
loan
Sep. 30, 2020
USD ($)
institution
loan
Apr. 30, 2020
USD ($)
instrument
Dec. 31, 2019
USD ($)
loan
Derivative [Line Items]        
Number of instruments terminated | instrument     3  
Termination value of derivatives $ (15,107) $ (15,107)   $ 966
Interest rate cash flow hedge increase decrease interest expense to be reclassified during next 12 months net 600 600    
Interest rate cash flow hedge gain (loss) reclassified to earnings, net $ (100) $ (300)    
Number of financial institutions | institution 4 4    
Number of variable-rate to fixed-rate swap transactions | loan 226 226   172
Notional amount $ 880,178 $ 880,178   $ 502,172
Minimum        
Derivative [Line Items]        
Remaining maturity period   1 year    
Maximum        
Derivative [Line Items]        
Remaining maturity period   15 years    
Interest rate swap        
Derivative [Line Items]        
Number of variable-rate to fixed-rate swap transactions | loan 223 223   156
Notional amount $ 1,100,000 $ 1,100,000   $ 941,000
Derivative liability 93,900 93,900   27,400
Securities        
Derivative [Line Items]        
Collateral value against obligations 8,400 8,400    
Cash        
Derivative [Line Items]        
Collateral value against obligations 11,100 11,100    
Swap Guarantee        
Derivative [Line Items]        
Derivative liability $ 12,200 $ 12,200   8,800
Designated as Hedging Instrument        
Derivative [Line Items]        
Termination value of derivatives     $ 1,300  
Notional amount       $ 75,000